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std::seed_seq::seed_seq(3) C++ Standard Libary std::seed_seq::seed_seq(3) NAME std::seed_seq::seed_seq - std::seed_seq::seed_seq Synopsis seed_seq() noexcept; (1) (since C++11) seed_seq( const seed_seq& ) = delete; (2) (since C++11) template< class InputIt > (3) (since C++11) seed_seq( InputIt begin, InputIt end ); template< class T > (4) (since C++11) seed_seq( std::initializer_list<T> il ); 1) The default constructor creates a std::seed_seq object with an initial seed sequence of length zero. 2) The copy constructor is deleted: std::seed_seq is not copyable. 3) Constructs a std::seed_seq with the initial seed sequence ob- tained by iterating over the range [begin, end) and copying the values obtained by dereferencing the iterator, modulo 232 (that is, the lower 32 bits are copied) 4) Equivalent to seed_seq(il.begin(), il.end()). This constructor enables list-initialization from the list of seed values. This overload par- ticipates in overload resolution only if T is an integer type. Parameters begin, end - the initial seed sequence represented as a pair of in- put iterators whose std::iterator_traits<>::value_type is an integer type il - std::initializer_list of objects of integer type, pro- viding the initial seed sequence Type requirements - InputIt must meet the requirements of LegacyInputIterator. Exceptions 3-4) Throws std::bad_alloc on allocation failure. Example // Run this code #include <random> #include <sstream> #include <iterator> int main() { std::seed_seq s1; // default-constructible std::seed_seq s2{1, 2, 3}; // can use list-initialization std::seed_seq s3 = {-1, 0, 1}; // another form of list-initializa- tion int a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; std::seed_seq s4(a, a + 10); // can use iterators std::istringstream buf("1 2 3 4 5"); std::istream_iterator<int> beg(buf), end; std::seed_seq s5(beg, end); // even stream input iterators } Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior the default constructor never fails but might LWG 3422 C++11 be not noexcept; made noexcept; the initializer list constructor disabled constrained list-initialization from iterator pairs http://cppreference.com 2022.07.31 std::seed_seq::seed_seq(3)
NAME | Synopsis | Parameters | Type requirements | Exceptions | Example
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